Lithium ion battery protection board circuit capable of storing and monitoring battery safety data and wirelessly and passively reading information

Abstract

According to the lithium ion battery protection board circuit with the functions of storing and monitoring battery safety data and wirelessly and passively reading information, the battery information of the detection module and the main control module is stored through the NFC wireless chip, the battery information stored in the NFC wireless chip is read in a wireless and passively mode by utilizing a wireless handheld terminal and a special APP, and the lithium ion battery protection board circuit can be used for storing and monitoring the battery safety data and wirelessly and passively reading the information. And the NFC wireless chip stores battery information and can be used without being powered by a battery, so that the NFC wireless chip can still be read by using the wireless handheld terminal after the battery runs out of power or the battery is damaged.

Description

Technical Field

[0001] The utility model relates to the technical field, in particular to a lithium-ion battery protection board circuit capable of storing and monitoring battery safety data and reading information wirelessly and passively. Background Art

[0002] In modern times, the invention of electricity has completely changed the development trajectory of human civilization. As a powerful form of energy, the widespread application of electricity has promoted rapid progress in industries, science and technology, medical care, transportation and communications, enabling human civilization to develop at an unprecedented speed and scale. The popularization of electricity has not only greatly improved production efficiency and quality of life, but also promoted the process of globalization and informatization, bringing profound changes to human society. Among them, there are many technical products invented because of electricity, and batteries are one of the indispensable products. Batteries are devices that convert chemical energy into electrical energy. Their main function is to store electrical energy and release electrical energy. They play a vital role in many application scenarios. However, due to their potential dangers, such as thermal runaway of batteries in the case of overcharge, over-discharge or short circuit, the battery will expand rapidly and cause explosion. In this regard, it is necessary to monitor the battery information to prevent battery accidents.

[0003] In the prior art, a battery board protection plate with Chinese utility model patent publication number: CN219576634U discloses a substrate, a main control circuit board and a contact piece. The contact piece is provided with a pressure sensor, a temperature sensor and a controller. The temperature sensor can detect the high temperature and pressure of the battery in real time and feed the information back to the controller. The contact piece is also provided with a channel and a groove for helping the main control circuit board to dissipate heat, and an isolation pad for isolating the high temperature of the battery substrate. The above technology can perform certain safety prevention functions for the battery, but once the battery protection board is damaged or the battery is out of power, the controller has no power input and cannot read and monitor the specific information of the battery. Utility Model Content

[0004] In view of the deficiency in the above technology that the battery information cannot be read after the battery protection board is damaged or the battery is exhausted, the utility model provides a lithium-ion battery protection board circuit that can store and monitor battery safety data and can read information wirelessly and passively.

[0005] To achieve the above purpose, the utility model provides a lithium-ion battery protection board circuit capable of storing and monitoring battery safety data and reading information wirelessly and passively, including:

[0006] A detection module, used to collect battery information and generate a collection signal;

[0007] The main control module is used to receive the acquisition signal, process the battery information and generate a storage signal;

[0008] The reading module is used to receive the storage signal, store the collected battery data information, and read the battery information in the reading module in a wireless communication manner.

[0009] As an improved solution of the utility model, the detection module includes a sampling chip, a charging detection circuit, a charging control circuit, a battery voltage detection circuit and a temperature detection circuit, the main control module includes an MCU main control chip, and the reading module includes an NFC wireless chip.

[0010] As an improved solution of the present utility model, the NFC wireless chip includes a first wireless receiving pin and a second wireless receiving pin, the MCU main control chip includes a first wireless signal pin and a second wireless signal pin, the sampling chip includes a third wireless signal pin and a fourth wireless signal pin, the first wireless signal pin and the third wireless signal pin are coupled to the first wireless receiving pin, and the second wireless signal pin and the fourth wireless signal pin are coupled to the second wireless receiving pin.

[0011] As an improved solution of the present utility model, the temperature detection circuit includes a first thermistor, a first capacitor and a first resistor, one end of the first thermistor, the first capacitor and the first resistor are coupled to the first temperature detection pin of the sampling chip, and the other end of the first thermistor, the first capacitor and the first resistor are coupled to the ground.

[0012] As an improved solution of the utility model, the charging detection circuit includes a second resistor, a third resistor, a second capacitor and a first transistor, the emitter of the first transistor is coupled to the charging detection pin of the main control chip, the collector of the first transistor, one end of the second capacitor and one end of the second resistor are commonly coupled to the ground, the base of the first transistor, the other end of the second capacitor and the other end of the second resistor are commonly coupled to one end of the third resistor, and the other end of the third resistor is coupled to the battery.

[0013] As an improved solution of the utility model, it also includes a signal socket, and the charging control circuit includes a second MOS tube, a second triode, a third triode and a first voltage-stabilizing diode. The drain of the second MOS tube is coupled to the signal socket, the gate is coupled to the collector of the second triode and the cathode of the first voltage-stabilizing diode, the source is coupled to the anode of the first voltage-stabilizing diode and is grounded, the base of the second triode is coupled to the collector of the third triode, the emitter is coupled to the charging signal pin of the sampling chip, the emitter of the third triode is grounded, and the base is coupled to the charging control pin of the MCU main control chip.

[0014] As an improved solution of the present utility model, the MCU main control chip includes a voltage output pin, and the detection module also includes a second thermistor, a third capacitor, a fourth resistor and a fifth resistor, one end of the fourth resistor is coupled to the voltage output pin, and the other end is coupled to the third capacitor, the second thermistor and one end of the fifth resistor, the other ends of the third capacitor and the second thermistor are coupled to the ground, and the other end of the fifth resistor is coupled to the second temperature detection pin of the MCU main control chip.

[0015] As an improved solution of the utility model, the battery voltage detection circuit also includes a third MOS tube, a second voltage regulator diode and a fourth transistor, the source of the third MOS tube is coupled to the cathode of the second voltage regulator diode and B+, the gate of the third MOS tube and the anode of the second voltage regulator diode are coupled to the emitter of the fourth transistor, the base of the fourth transistor is coupled to the voltage output pin of the MCU main control chip, the collector of the fourth transistor is grounded, and the drain of the third MOS tube is coupled to the pin of the MCU main control chip and is grounded.

[0016] As an improved solution of the present utility model, the main control module, the detection module and the reading module transmit data signals in a serial communication manner.

[0017] As an improved solution of the utility model, the MCU main control chip model is HT66F3195, the sampling chip model is OZ7714, and the NFC wireless chip model is ST25DV04KC.

[0018] The beneficial effects of the utility model are as follows: compared with the prior art, the utility model provides a lithium-ion battery protection board circuit with the function of storing and monitoring battery safety data and capable of wirelessly and passively reading information. Battery information is collected through multiple detection circuits and sampling chips of the detection module, and data is transmitted in the form of serial communication. The NFC wireless chip is used to store the battery information collected by the detection module and the main control module. The battery information stored in the NFC wireless chip is read wirelessly and passively through a wireless handheld terminal and a dedicated APP. Moreover, since the NFC wireless chip itself stores the battery information, it can be used without battery power. Therefore, when the battery is exhausted or damaged, the wireless handheld terminal can still be used to read the NFC wireless chip. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is the circuit diagram of the main control chip of the utility model;

[0020] Figure 2 This is a battery voltage detection circuit diagram of the utility model;

[0021] Figure 3 This is the circuit diagram of the NFC wireless chip of the utility model;

[0022] Figure 4 This is a battery discharge detection circuit diagram of the utility model;

[0023] Figure 5 This is a charging detection circuit diagram of the utility model;

[0024] Figure 6 This is the circuit diagram of the sampling chip of the utility model;

[0025] Figure 7 It is a schematic diagram of the module flow of the utility model;

[0026] Figure 8 This is a schematic diagram of the circuit signal flow of the utility model. DETAILED DESCRIPTION

[0027] In order to more clearly illustrate the present invention, the present invention is further described below in conjunction with the accompanying drawings.

[0028] See also Figure 1-Figure 8 The utility model provides a lithium-ion battery protection board circuit capable of storing and monitoring battery safety data and reading information wirelessly and passively, including:

[0029] A detection module, used to collect battery information and generate a collection signal;

[0030] The main control module is used to receive the acquisition signal, process the battery information and generate a storage signal;

[0031] The reading module is used to receive the storage signal, store the collected battery data information, and read the battery information in the reading module in a wireless communication manner.

[0032] The utility model collects and stores the information of the battery through the detection module. The collected information, such as the highest and lowest temperatures of charging and discharging of the battery in one day, the number of charging and discharging times, the maximum charging and discharging current and voltage values, or the battery power and other data, generates a corresponding collection signal after the detection module completes the collection, and sends it to the main control module through the serial port communication mode. The main control module receives the collection signal and processes the battery information, converts the battery information into intuitive data, and generates a storage signal and sends it to the reading module. After the reading module receives the storage signal, it reads the reading module through a handheld terminal with wireless communication function, wherein the handheld terminal can be a mobile phone or a dedicated handheld terminal. The reading module can also save the conventional fixed information of the battery, such as the production date, manufacturer, battery model and specifications, and custom information at the factory. Because the reading module receives the signal from the main control module by serial communication, and it can store the battery information itself, and the handheld terminal reads the reading module by wireless communication, so after the battery is exhausted or the battery protection board is damaged, the battery information of the reading module can still be successfully read. The battery information can be intuitively seen through the dedicated APP, and the specific situation of the battery can be clearly understood. According to the abnormality of a certain data of the battery, the reason why the battery cannot power supply can be accurately determined and corresponding operations can be performed.

[0033] See also Figure 1 , Figure 3 and Figure 6 Among them, the detection module includes a sampling chip U3 of model OZ7714. The sampling chip U3 can detect the maximum and minimum temperatures of battery charging and discharging, the number of charging and discharging, the maximum charging and discharging current and voltage values. In addition, the main control module uses the MCU main control chip U1 of model HT66F3195 to read the battery information collected by the sampling chip U3 and analyze it, and then transmit it to the reading module. The reading module uses the NFC wireless chip U4 of model ST25DV04KC. The NFC wireless chip U4 itself has a storage function and can store the battery information transmitted by the MCU main control chip U1. Through a mobile phone or other The wireless handheld terminal can read data through the NFC wireless chip U4 and cooperate with a dedicated APP to obtain the current specific information of the battery. Since the NFC wireless chip U4 uses NFC wireless transmission technology for communication, the battery does not need to provide power during the reading of the protection board. When the battery board protection is damaged or the battery is exhausted, the NFC wireless chip U4 can also be used to perform wireless and passive reading of the battery protection board information. Wireless and passive means that there is no need to provide power input to the battery protection board. You only need to use a mobile phone or other dedicated wireless terminal that matches the NFC wireless chip to complete the wireless and passive reading of the battery information through NFC wireless communication technology.

[0034] See also Figure 3 , the NFC wireless chip U4 includes a first wireless signal pin and a second wireless signal pin (corresponding to pins 5 and 6 of U4), the sampling chip U3 includes a third wireless signal pin and a fourth wireless signal pin (corresponding to pins 23 and 22 of U3), the MCU main control chip U1 includes a first wireless receiving pin and a second wireless receiving pin (corresponding to pins 9 and 10 of U1), the first wireless signal pin and the third wireless signal pin are coupled to the first wireless receiving pin, the second wireless signal pin and the fourth wireless signal pin are coupled to the second wireless receiving pin, and the MCU main control chip U1 mainly uses I²C serial port communication to transmit data with the NFC wireless chip U4 and the sampling chip U3, ensuring the low power consumption operation of the battery protection board.

[0035] See also Figure 1 and Figure 6 The temperature detection circuit includes a first thermistor K2, a first capacitor C5 and a first resistor R19. One end of the first thermistor K2, the first capacitor C5 and the first resistor R19 is coupled to the first temperature detection pin of the sampling chip U3 (corresponding to the No. 17 pin of the sampling chip U3), and the other end is coupled to the ground. The MCU main control chip U1 also includes a voltage output pin (corresponding to the No. 17 pin of the MCU main control chip U1), a second thermistor K3, a third capacitor C41, a fourth resistor R62 and a fifth resistor R65. One end of the fourth resistor R62 is coupled to the voltage output, and the other end is coupled to the third capacitor C41, the second thermistor K3, the third capacitor C41, the fourth resistor R62 and the fifth resistor R65. 3 is coupled to one end of the fifth resistor R65, the other ends of the third capacitor C41 and the second thermistor K3 are coupled to the ground, and the other end of the fifth resistor R65 is coupled to the second temperature detection pin of the MCU main control chip (corresponding to the 16th pin of the MCU main control chip U1); wherein the first thermistor K2 and the second thermistor K3 are used to detect the temperature of the battery. Due to the resistance characteristics of the thermistor itself, its resistance value changes linearly with the temperature change of the battery. Therefore, the temperature of the battery during charging and discharging can be measured by the thermistor. By adopting dual thermistors to measure the battery temperature together, the real-time temperature of the battery can be recorded and monitored.

[0036] See also Figure 2The battery voltage detection circuit also includes a third MOS tube T23, a second voltage stabilizing diode Z1 and a fourth transistor T24. The source of the third MOS tube T23 is coupled to the cathode of the second voltage stabilizing diode Z1 and the battery B+. The gate of the third MOS tube T23 and the anode of the second voltage stabilizing diode Z1 are coupled to the emitter of the fourth transistor T24. The base of the fourth transistor T24 is coupled to the voltage output pin of the MCU main control chip U1 (equivalent to the No. 17 pin of the MCU main control chip U1). The collector of the fourth transistor T24 is grounded. The drain of the OS tube is coupled to the voltage detection pin of the MCU main control chip (equivalent to pin 19 of the MCU main control chip U1) and is grounded. The MCU main control chip U1 inputs voltage to the base of the fourth transistor T24 through the voltage output pin, turns on the fourth transistor T24, and current flows to the gate of the third MOS tube T23, turning on the third MOS tube T23. The voltage of the battery B+ flows to the voltage detection pin, and the battery voltage is obtained through the voltage change of the voltage detection pin. Finally, it is transmitted to the NFC wireless chip U4 through the MCU main control chip U1 for storage.

[0037] See also Figure 5 The charging detection circuit includes a second resistor R11, a third resistor R10, a second capacitor C11 and a first transistor T7. The emitter of the first transistor T7 is coupled to the charging detection pin of the main control chip U1 (equivalent to the No. 8 pin of the MCU main control chip U1). The collector of the first transistor T7, the second capacitor C11 and one end of the second resistor R11 are coupled to the ground. The base of the first transistor T7, the second capacitor C11 and the other end of the second resistor R11 are coupled to one end of the third resistor R10. The other end of the third resistor R10 is coupled to the battery C+. After the battery C+ inputs a voltage, it passes through the current limiting of the resistor R10 to the base of the first transistor T1, so that the first transistor T1 is turned on, so that the current reaches the charging detection pin, and the number of times the first transistor T1 is turned on is used to detect the number of times the battery is charged.

[0038] It also includes a signal socket JIP8, and the charging control circuit includes a second MOS tube T22, a second transistor T18, a third transistor T21 and a first voltage-stabilizing diode Z3. The drain of the second MOS tube T22 is coupled to the CDK pin of the signal socket JIP8, the gate is coupled to the collector of the second transistor T18 and the cathode of the first voltage-stabilizing diode Z3, the source is coupled to the anode of the first voltage-stabilizing diode Z3 and is grounded, the base of the second transistor T18 is coupled to the collector of the third transistor T21, the emitter is coupled to the charging signal pin of the sampling chip (equivalent to the No. 21 pin of the sampling chip U3), and the third transistor T21 is coupled to the charging signal pin of the sampling chip U3. The emitter of the transistor T21 is grounded, and the base is coupled to the charging control pin of the MCU main control chip U1 (equivalent to pin 18 of the MCU main control chip U1); the main control chip U1 inputs a signal of whether the battery is charged to the charging control circuit through the charging control pin, and the current is divided into two paths and flows to the base of the third transistor T21 to turn it on and passes through the resistor R47 to the charging signal pin of the sampling chip U3, and then the current flows from the collector of the third transistor T21 to the base of the second transistor T18 to turn it on, and finally flows to the gate of the second MOS tube T22 to turn it on, and enters the CDK pin of the signal socket JIP8 to control the charging of the battery.

[0039] Among them, it also includes a power supply chip U2, which is used to supply power to the MCU main control chip U1. The power supply chip U2 includes pin 1, pin 2 and pin 3, wherein pin 1 is grounded, pin 2 is used to couple with battery B+, and diode D4, the fifth transistor T1, the sixth transistor T2, and the voltage regulator diode Z4 are connected between pin 2 and B+. The cathode of the diode D4 is coupled to pin 2, the anode is coupled to the emitter of the fifth transistor T1, the base of the fifth transistor T1 is coupled to the emitter of the sixth transistor T2, the collector of the fifth transistor T1 and the collector of the sixth transistor T2 are coupled to the battery B+, and the base of the sixth transistor T2 is coupled to the battery B+. It is coupled to the cathode of the Zener diode Z4, and the anode of the Zener diode Z4 is coupled to the ground, wherein the diode is used to protect the circuit to prevent excessive current from being input to the power supply chip U2, and the fifth transistor T1 and the sixth transistor T2 are connected in series, which is beneficial to the stability of the entire circuit, and cooperates with the Zener diode Z4 to ensure that the circuit will not generate overvoltage. Pin 3 of the power supply chip U2 is coupled to the power input pin of the MCU main control chip U1 (corresponding to pin 20 of the MCU main control chip U1), and the power input from the battery B+ directly provides stable power input to the MCU main control chip U1 after passing through pin 2, so that the MCU main control chip U1 can work normally.

[0040] In order to further protect the battery protection board from being burned, the NFC reading part and storage part of the battery protection board will have a fire-proof and high-temperature resistant shell made of aerogel and ceramic fiber, including but not limited to, to ensure that in the event of an accidental fire, the corresponding battery pack information can still be obtained in a timely and accurate manner.

[0041] The advantages of the utility model are:

[0042] 1) The battery information of the detection module and the main control module is stored in the NFC wireless chip, and the battery information stored in the NFC wireless chip is read in a wireless passive manner using a wireless handheld terminal and a dedicated APP.

[0043] 2) It has multiple detection circuits for monitoring battery information, which can monitor battery data to ensure battery safety.

[0044] The above disclosures are only several specific embodiments of the present invention, but the present invention is not limited thereto, and any changes that can be conceived by those skilled in the art should fall within the protection scope of the present invention.

Claims

1. A lithium-ion battery protection board circuit capable of storing and monitoring battery safety data and reading information wirelessly and passively, characterized in that: include, A detection module, used to collect battery information and generate a collection signal; The main control module is used to receive the acquisition signal, process the battery information and generate a storage signal; The reading module is used to receive the storage signal, store the collected battery data information, and read the battery information in the reading module in a wireless communication manner.

2. A lithium-ion battery protection board circuit capable of storing and monitoring battery safety data and reading information wirelessly and passively according to claim 1, characterized in that: The detection module includes a sampling chip, a charging detection circuit, a charging control circuit, a battery voltage detection circuit and a temperature detection circuit; the main control module includes an MCU main control chip; and the reading module includes an NFC wireless chip.

3. A lithium-ion battery protection board circuit capable of storing and monitoring battery safety data and reading information wirelessly and passively according to claim 2, characterized in that: The NFC wireless chip includes a first wireless receiving pin and a second wireless receiving pin, the MCU main control chip includes a first wireless signal pin and a second wireless signal pin, the sampling chip includes a third wireless signal pin and a fourth wireless signal pin, the first wireless signal pin and the third wireless signal pin are coupled to the first wireless receiving pin, and the second wireless signal pin and the fourth wireless signal pin are coupled to the second wireless receiving pin.

4. A lithium-ion battery protection board circuit capable of storing and monitoring battery safety data and reading information wirelessly and passively according to claim 2, characterized in that: The temperature detection circuit includes a first thermistor, a first capacitor and a first resistor, one end of the first thermistor, the first capacitor and the first resistor are coupled to the first temperature detection pin of the sampling chip, and the other end of the first thermistor, the first capacitor and the first resistor are coupled to the ground.

5. A lithium-ion battery protection board circuit capable of storing and monitoring battery safety data and reading information wirelessly and passively according to claim 2, characterized in that: The charging detection circuit includes a second resistor, a third resistor, a second capacitor and a first transistor, the emitter of the first transistor is coupled to the charging detection pin of the main control chip, the collector of the first transistor, one end of the second capacitor and one end of the second resistor are commonly coupled to the ground, the base of the first transistor, the other end of the second capacitor and the other end of the second resistor are commonly coupled to one end of the third resistor, and the other end of the third resistor is coupled to the battery.

6. A lithium-ion battery protection board circuit capable of storing and monitoring battery safety data and reading information wirelessly and passively according to claim 2, characterized in that: It also includes a signal socket, and the charging control circuit includes a second MOS tube, a second triode, a third triode and a first voltage-stabilizing diode. The drain of the second MOS tube is coupled to the signal socket, the gate is coupled to the collector of the second triode and the cathode of the first voltage-stabilizing diode, the source is coupled to the anode of the first voltage-stabilizing diode and is grounded, the base of the second triode is coupled to the collector of the third triode, the emitter is coupled to the charging signal pin of the sampling chip, the emitter of the third triode is grounded, and the base is coupled to the charging control pin of the MCU main control chip.

7. A lithium-ion battery protection board circuit capable of storing and monitoring battery safety data and reading information wirelessly and passively according to claim 2, characterized in that: The MCU main control chip includes a voltage output pin, and the detection module also includes a second thermistor, a third capacitor, a fourth resistor and a fifth resistor, one end of the fourth resistor is coupled to the voltage output pin, and the other end is coupled to the third capacitor, the second thermistor and one end of the fifth resistor, the other ends of the third capacitor and the second thermistor are coupled to the ground, and the other end of the fifth resistor is coupled to the second temperature detection pin of the MCU main control chip.

8. A lithium-ion battery protection board circuit capable of storing and monitoring battery safety data and reading information wirelessly and passively according to claim 2, characterized in that: The battery voltage detection circuit also includes a third MOS tube, a second voltage regulator diode and a fourth transistor, the source of the third MOS tube is coupled to the cathode of the second voltage regulator diode and B+, the gate of the third MOS tube and the anode of the second voltage regulator diode are coupled to the emitter of the fourth transistor, the base of the fourth transistor is coupled to the voltage output pin of the MCU main control chip, the collector of the fourth transistor is grounded, and the drain of the third MOS tube is coupled to the pin of the MCU main control chip and grounded.

9. A lithium-ion battery protection board circuit capable of storing and monitoring battery safety data and reading information wirelessly and passively according to claim 2, characterized in that: The main control module, the detection module and the reading module transmit data signals in a serial communication manner.

10. A lithium-ion battery protection board circuit capable of storing and monitoring battery safety data and reading information wirelessly and passively according to claim 2, characterized in that: The MCU main control chip model is HT66F3195, the sampling chip model is OZ7714, and the NFC wireless chip model is ST25DV04KC.

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